Study On Salt Tolerance Of Vegetative Growth Of10Alfalfa Varieties

Soil salinization and secondary salinization prevalent in our country and around the world, hasseriously affected the ecological environment. Planting salt-tolerant plants are most scholars believeis one of the most cost-effective measures to saline soil improvement, to improve the productivityand utilization of saline-alkali soil has a very important significance. Alfalfa is known as the "king ofgrass " reputation, good yields of high quality, there are certain to salt stress tolerance, but undersalt stress conditions, alfalfa seedling emergence, growth, yield and nutritional value will still beinhibited, Hence the need to nurture and identification of salt stress adaptable alfalfa varieties,providing large amounts of data for the classification and management of alfalfa resources.Currently our existing salt tolerance of alfalfa seed germination standards are mostlyconcentrated in the identification phase of grading, planting alfalfa plants lower reference value, thepresent study0mmol/L (CK),75mmol/L,150mmol/L225mmol/L4sulfate solution gradientof10kinds of vegetative growth of alfalfa coercion treatment, research in survival under differentsalt concentrations10kinds of vegetative growth of alfalfa, height growth in volume, abovegroundbiomass, belowground biomass measuring the amount of chlorophyll a/b, free proline content,superoxide dismutase activity and other indicators of membrane permeability and analysis of these10kinds of alfalfa ability to adapt to environmental stress, high salt were evaluated for future thepractical application of reference. The results were as follows:1) With the increase of salt concentration, and10kinds of vegetative growth of alfalfasurvival, the amount of height growth, aboveground biomass and belowground biomass decreased,salt stress inhibits the growth of plants. Prairie No.1, in which the best and worst Zhaodong.2) after salt stress treatment,10kinds of alfalfa chlorophyll a/b ups and downs, alfalfaAU10VRN, the clover3, No.1, Prairie salt concentration of75mmol/L is the most adaptable;1inclover salt concentration was150mmol/L in the most adaptable; Ao Han, Zhaodong, dragon,animal husbandry,801,803Mu Lung, alfalfa IFK Dara was the most adaptable in225mmol/L of.salt concentration3) Accumulation of proline content increased with the concentration showed an upwardtrend.Longmu803in the concentration of75mmol/L has the most adaptable; Zhaodong,Nongjing1in the salt concentration of the150mmol/L hasmost adaptable; Ao Han, Longmu801,Nongjing1, alfalfa AU10VRN, alfalfa IFK Dara in the salt concentration of150mmol/L has the most adaptable.4) When the salt concentration was150mmol/L and225mmol/L, the Ao Han, Zhaodong,Zhongmu1, Nongjing1superoxide dismutase activity compared with the control group wassignificantly increased, Ao Han, Zhaodong,Zhongmu1Nongjing1, superoxide dismutase activityconcentration of salt stress has most adaptable of225mmol/L.5）With the concentration,relative conductivity increases showed an upward trend. Zhaodong,Longmu803,Nongjing1, alfalfa IFK Dara, Zhongmu.3, prairie No.1relative conductivity withincreasing salt concentration showed a the rise, Zhaodong in the concentration of150mmol/L thecell damage is more serious, and the dragon, animal husbandry,803, Nongjing1, alfalfa IFK Dara,Zhongmu3, Zhongmu at225mmol/L when the damage is more serious.